American fern journal - American Fern Society. (American Fern Society, 1991)

American fern journal - American Fern Society. (American Fern Society, 1992)

American fern journal - American Fern Society. (American Fern Society, 1994)

American fern journal - American Fern Society. (American Fern Society, 1993)

American fern journal - American Fern Society. (American Fern Society, 1995)

American fern journal - American Fern Society. (American Fern Society, 1996)

American fern journal - American Fern Society. (American Fern Society, 1997)

American fern journal - American Fern Society. (American Fern Society, 1998)

American fern journal - American Fern Society. (American Fern Society, 1999)

American fern journal - American Fern Society. (American Fern Society, 2000)

American fern journal - American Fern Society. (American Fern Society, 2001)

American fern journal - American Fern Society. (American Fern Society, 2002)

American fern journal - American Fern Society. (American Fern Society, 2003)

American fern journal - American Fern Society. (American Fern Society, 2004)

American fern journal - American Fern Society. (American Fern Society, 2005)

American fern journal - American Fern Society. (American Fern Society, 2006)

American fern journal - American Fern Society. (American Fern Society, 2007)

American fern journal - American Fern Society. (American Fern Society, 2008)